<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script>
        let str = 'apple banana pera';
        // console.log(str.indexOf('banana'));

        // if(str.indexOf('banana') != -1){
        //     console.log(true);
        // }else{
        //     console.log(false);
        // }

        console.log(str.includes('banana'));
    </script>
</head>
<body>
    
</body>
</html>